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An ideal step-down transformer is connected to a 3300 V transmission line. It is used to power a 220 V , 66 W electrical appliance. What is the current drawn by the primary coil of the transformer?

Options

  1. A0.3 A
  2. B20 mA
  3. C0.2 A
  4. D2 A

Correct answer

B. 20 mA

Step-by-step solution

For an ideal transformer, the input power to the primary coil is equal to the output power from the secondary coil. P_p = P_s V_p I_p = P_s Substituting the given values: 3300 I_p = 66 I_p = 66 3300 I_p = 0.02 A I_p = 20 mA Answer: 20 mA

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